def test_sequencetools_all_are_nonnegative_integer_powers_of_two_01():
r'''True when all elements in sequence are nonnegative integer powers of two.
'''
assert sequencetools.all_are_nonnegative_integer_powers_of_two([1, 2, 256, 8, 16, 16, 16])
def test_sequencetools_all_are_nonnegative_integer_powers_of_two_03():
r'''False otherwise.
'''
assert not sequencetools.all_are_nonnegative_integer_powers_of_two([3])
assert not sequencetools.all_are_nonnegative_integer_powers_of_two([1, 2, 4, 8, 16, 17])
def test_sequencetools_all_are_nonnegative_integer_powers_of_two_04():
r'''False when expr is not a sequence.
'''
assert not sequencetools.all_are_nonnegative_integer_powers_of_two(16)
def test_sequencetools_all_are_nonnegative_integer_powers_of_two_02():
r'''True on empty sequence.
'''
assert sequencetools.all_are_nonnegative_integer_powers_of_two([])
